The problem with returning from vacation is that you wake up the next morning and realize that this is NOT Paris, or Chautauqua, it's Mississauga. This is a very sad thing about vacationing.
The good news is, that if you want to, you can sign up for a FREE 15 day subscription to the "Great Lecture Library" (blue link below) and hear the lectures that I have heard over the years. You may want to be a little selective, and the lectures are long...usually about an hour in length, but well worth the effort of sitting with a coffee in front of your computer and listening. Listening is something you can do in the summer-time. It's what you do at Chautauqua. Try it.
Some of my favourites that you can look for in the link provided below are:
 Loretta LaRoche "Developing a Healing Consciousness Through Humor and Stress"
 Dr. Arthur Caplan "Is it Immoral to Want to Live Longer, Be Smarter, and Look Better?"
 Dr. H.J. deBlij "Climate, Population, and Cultures in a Shrinking World"
 Maude Barlow "Blue Gold: The Political Struggle for the World's Water"
You can slide the bar along to pass over the introductory remarks to the audience sitting listening to these lectures in the open air amphitheater or take in the entire experience. Close your eyes and you could be there.
There are also podcasts: